Original Post
What format should I choose for using Direct3D with sprites? I saw the format X8R8G8B8 is it a common format that will be available for most platforms? what does the X stands for?
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Direct3D format
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Yes, X is unused. The reason for it's existance is that it's actually faster for the card to waste a little space and store a 24 bit color in 32 bits. Many cards today don't even support the 24 bit version of the format, and only offer the 32 bit version with the wasted 8 bits.
How would I choose the most compatible format?
Should I make a list of formats with the first the highest priority to the last with the lowest priority?
I will not have any problem with supporting different formats, in terms of loading images into texture and blitting? In other words, will it be simple to have a loading image into texture mexhanisem that supports all the formats and to blitting as well?
Should I make a list of formats with the first the highest priority to the last with the lowest priority?
I will not have any problem with supporting different formats, in terms of loading images into texture and blitting? In other words, will it be simple to have a loading image into texture mexhanisem that supports all the formats and to blitting as well?
Quote:IDirect3D9::CheckDeviceFormat.
Original post by The C modest god
How would I choose the most compatible format?
Ok, there are several types of formats.
Which ones from the formats should I check?
I guess I wouldnt want to use such a format:
D3DFMT_A8 8-bit alpha only
How can I use that kind of format?
Or should I check all the formats including the weird 8-bit alpha only format?
Or should I check for only formats with at least 8bit for each RGB?
What is the difference between a format with alpha and one without in respect to sprites? Does in the format without the alpha I wouldnt be able to have transculerancy in sprites? for example I want to have a pixel that will blend 50% with the background color and 50% from its own color.
So what formats should I check?
Which ones from the formats should I check?
I guess I wouldnt want to use such a format:
D3DFMT_A8 8-bit alpha only
How can I use that kind of format?
Or should I check all the formats including the weird 8-bit alpha only format?
Or should I check for only formats with at least 8bit for each RGB?
What is the difference between a format with alpha and one without in respect to sprites? Does in the format without the alpha I wouldnt be able to have transculerancy in sprites? for example I want to have a pixel that will blend 50% with the background color and 50% from its own color.
So what formats should I check?
I think I would want X8R8G8B8 format for the screen and A8R8G8B8 for the textures so I could do alpha blending to the sprites. I cant seen any other formats that would be suitable, then why should I check for more formats?
Quote:
Original post by The C modest god
I think I would want X8R8G8B8 format for the screen and A8R8G8B8 for the textures so I could do alpha blending to the sprites. I cant seen any other formats that would be suitable, then why should I check for more formats?
Because some cards may not support them. You might save memory with 16-bit textures if you don't need 32-bit ones, and hence run on lower-end systems, ...etc
For the back-buffer/texture, you can have things like:
X1R5G6B5
X4R4G4B4
A1R5G6B5
A4R4G4B4
...etc (lookup D3DFORMAT)
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